Hi,
I am currently working on adding the ddcutil tool to my Yocto image, which includes HDMI support through the ADV7535 bridge. The HDMI output is working fine, but when I run the ddcutil tool, I get the error “No displays found”, even though the HDMI display is functioning correctly.
It seems that ddcutil requires a sysfs entry such as:
/sys/class/drm/card0-HDMI/i2c-*
or
/sys/class/drm/card0-HDMI/ddc
However, these entries are missing on our system.
Is it possible to enable the DDC I²C entry in sysfs through modifications to the ADV7535 driver.
driver for adv7535 :- drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
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